Abstract

Modal birefringence and its sensitivity to temperature and
hydrostatic pressure were measured versus wavelength in three
elliptical-core fibers and one fiber with stress-induced
birefringence. We carried out the measurements in the spectral
range from 633 to 843 nm by using interferometric methods. In
fibers with elliptical cores all the measured parameters showed high
chromatic dependence, whereas in fibers with stress-induced
birefringence this dependence was weak. We modeled the dispersion
characteristics of two elliptical-core fibers by using the modified
perturbation approach first proposed by Kumar. The modification
consists of introducing into the expression for the normalized
propagation constants an additional perturbation term that contains
information about stress-induced birefringence. The results of
modeling show that the temperature and pressure sensitivity of
elliptical-core fiber are associated primarily with variations in
stress induced by these parameters. The agreement between measured
and calculated values of sensitivity in the worst case was equal to
20% for modal birefringence and temperature sensitivity and 50% for
pressure sensitivity. Lower agreement between measured and
calculated values of pressure sensitivity is most probably associated
with uncertainties in the material constants used in
modeling.

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